Cap for air compressor



FIG. 1 is a front perspective view of a cap for air compressor showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a right side elevational view thereof;

FIG. 8 is a rear elevational view thereof; and,

FIG. 9 is a rear perspective view thereof, the depressions, and the coupling port and the swellings depicted by means of broken lines being for illustrative purposes only and forming no part of the claimed design. 

The ornamental design for a cap for air compressor, as shown and described. 